Combined Production Systems Research Articles

Multi-criteria decision-making for techno-economic and environmentally sustainable decentralized hybrid power and green hydrogen cogeneration system

For global sustainable development, supplying reliable, clean and affordable energy to all is critical. Also to achieve the stringent carbon emission reduction target, the global energy transition is towards increasing the renewable share of total power generation. As renewable resources are intermittent, widely variable and nature dependent, a decentralized hybrid energy system may be the potential solution to address these issues. However, mismatch between energy demand and generation of such systems is a critical problem that needs to be addressed. Excess power generated than local instantaneous demand must be utilized in a sustainable way. Production of hydrogen can address the above issues as it has large capacity and long term power absorption capability. Currently it is considered as a valuable energy carrier. This work proposes to convert the excess electricity of a distributed system to a value added by-product, i.e., ‘green’ hydrogen. This study presented an integrated methodology to evaluate the overall sustainability, i.e., techno-economic and environmental performances of this combined electricity and hydrogen production system. These sustainability assessments do not converge to a single optimal solution. Therefore, a multi-criteria decision making approach is adopted to decide the acceptable sustainable solution. This integrated methodology concludes that the solar-wind-diesel-battery-electrolyser combination is the acceptable optimal solution. It meets the required load and produces hydrogen as a by-product at least cost with optimal environmental impact (cost of electricity-$ 0.252/kWh, cost of hydrogen-$ 2.59/kg, renewable share- 98.4%, payback period- 6.1 yrs, human health- 76476.7 DALY, ecosystem 54.17 species.yr and resource-61521013 USD 2013).

Simulation and 4E analysis of a novel coke oven gas-fed combined power, methanol, and oxygen production system: Application of solid oxide fuel cell and methanol synthesis unit

To address an innovative trigeneration process using coke oven gas as the input fuel, a novel heat integration process based on a solid oxide fuel cell is designed and discussed in the current research. Since the coke oven gas is a hydrogen-enriched fuel, its application in a solid oxide fuel cell power plant can improve sustainability and environmental indexes. The flue gas leaving the fuel cell subsystem is directed to a Kalina power cycle and an absorption power cycle for heat recovery, wherein additional power is available. Accordingly, the rejected flue gas is sent into a methanol synthesis unit for producing methanol. A part of generated electric power is delivered to a proton electrolyte membrane electrolyzer, where the water electrolysis process generates hydrogen and oxygen. Here, the generated hydrogen is delivered to the methanol synthesis unit. This system is simulated in the Aspen HYSYS software. To study the designed system, energy, exergy, environmental, and economic assessments are considered. In addition, a sensitivity study based on the main variables is performed. According to the results, the energy and exergy efficiencies of the whole structure are 34.69% and 88.885, respectively. In addition, the methanol production cost was 0.595 $/kg. The CO2 emission intensity is found to be 0.18 kgCO2/kgMeOH. So, the use of coke oven gas reduced the environmental threats considerably.

Unmasking adaption of tree root structure in agroforestry Systems in Switzerland using GPR

The interest in agroforestry systems has increased considerably in recent years. The systems are more resilient to climate change and offer advantages related to soil health and biodiversity. Although the aboveground impacts of agroforestry systems are well known, the knowledge concerning root growth of trees remains limited.This study tested the applicability of a non-destructive investigation method, the ground penetrating radar (GPR), to detect tree roots. We mapped two 80-year-old pear trees in cropland and investigated the impact of tilled and no-tilled management on the root system architecture especially in deeper soils (>0.6 m).The root mapping method was successful, we determined the main roots of the tree up to a depth of 0.75 m. In addition, we found tillage significantly impacted root distribution. Tillage removed tree roots almost completely to a depth of 0.4 m. The bulk of the roots was present at a depth of 0.6 to 0.75 m (83% of the roots) in the tilled section, while it was found at 0.3 to 0.55 m (74%) in the no-tilled section. Detected roots indicated an overcompensation by additional roots in the tilled section that were not formed without tillage.Overall, we found agroforestry trees were rooting deeper, below the managed cropland and therefore colonise different soil layers. Thus, the potential volume of water and nutrient intake was enlarged, which might enhance the resilience of the combined production systems. In addition, our approach presents a method for future non-destructive and continuous monitoring of tree roots and their development.

The Decline and Possible Return of Silvipastoral Agroforestry in Sweden

Silvipastoral agroforestry in the form of forest grazing and wooded semi-natural pastures has historically been very important for the Swedish supply of food and wood products for local use. Since the end of the 1800s, this form of combined production system has greatly decreased and now covers only 1% of Sweden’s land area. However, in recent decades it has gained increased relevance for reasons of landscape, biodiversity and climate. Agroforestry’s decline and possible future increase are described through reviews of statistics and the literature read by farmers and politicians whose decisions are behind the development. Especially when it comes to biodiversity and climate, this review also includes the scientific literature. Surveys on Swedish citizens’ valuation of silvipastoral agroforestry landscapes compared to treeless pasture and closed forest are also reviewed. It is possible that efforts to increase Sweden’s low self-sufficiency in beef and lamb meat, the coming requirements according to the EU’s nature restoration law and the need to limit climate change through carbon sequestration in trees may again increase the area of silvipastoral agroforestry. For this to be economically feasible, large grazing areas can be created out of remaining small scattered wooded semi-natural pastures and intervening forestland, which historically may have been grazed forests.

Growth and Productivity of Cauliflower in Aonla Based Multistoried Agroforestry System

Fruit tree vegetable-based agroforestry systems (FVAS) are being introduced in highland cropping systems of Bangladesh. This combined production system is applicable against changing climate, ensuring nutritional requirements along with food security, ecological balance, and economic profitability. The present study explored the performance of cauliflower as lower story crop in aonla based multistoried agroforestry system. The experiment was laid out in randomized complete block design (RCBD) with four replication. The treatments were T1= Aonla + carambola + lemon + dragon fruit + cauliflower, T2= Aonla + dragon fruit + cauliflower, T3= Dragon fruit + cauliflower, T4= Cauliflower in the open field (Control). Among different combinations of agroforestry systems, the highest curd yield of cauliflower (15 t ha-1) was recorded under dragon fruit-based system (T3) whereas most of the morphological parameters were maximum in the aonla + carambola + lemon + dragon fruit-based system (T1). The highest benefit–cost ratio (2.95) was noted in aonla+dragon+cauliflower-based system (T2) followed by dragon fruit based system (T3), while the highest land equivalent ratio (3.78) was calculated in the aonla + carambola + lemon + dragon fruit-based system (T1). This study revealed that, aonla + dragon + cauliflower based agroforestry system showed relatively higher economic returns and maximum land use efficiency in the upland cropping system.

Optimization and analysis of combined heat and water production system based on a coal-fired power plant

The combined heat and water (CHW) system has been studied by many scholars since it was proposed, and a project has been implemented in Shandong, China in 2021. However, there have been few studies on optimization and comparisons of cases on the heat source side of CHW. Taking a coal-fired thermal power plant as an example, through the reasonable matching of steam flows and analysis of thermal economic parameters, the effect number and heat source steam temperature of a multi-effect distillation (MED) + multi-stage flash (MSF) combined heat and water production (CHWP) system were optimized. The optimal MED heat source temperature was found to be 70 °C, and the optimal MED and MSF effect numbers were 10 and 5, respectively. Finally, the waste heat in the power plant was utilized as much as possible throughout the year. Compared with two cases of the separate heat and water production (SHWP) system, the CHWP system easily achieved better water quality and economy under the condition of almost equal exergy efficiency, and it was easier to realize than the first case of the SHWP system.

Welfare assessment of Krškopolje pigs reared in different production systems

In the present case study, the welfare of local breed (Krškopolje pig) pigs reared indoors, outdoors, and in combined production systems (total of 10 farms) were evaluated. The multidimensional Welfare Quality® assessment protocol, with slight modifications, was used to evaluate the farms. Animal-based observations were used to examine the four main principles of welfare (good feeding, good housing, good health, and appropriate behaviour) and their twelve independent welfare sub-criteria. Scores for each criterion were calculated and each farm was classified into one of the four welfare categories (excellent, enhanced, acceptable, or not classified). Maximal total scores were determined for the “good feeding” principle in the indoor and combined systems, whereas the outdoor system had a lower score (64) because of insufficient water troughs. In the case of “good housing” principle, maximal total scores were attributed to outdoor system, and lower scores for indoor and combined systems (72 and 84, respectively) due to the lesser space allowance, dirtiness and shivering in pigs. The scores for the “principle of good health” were rather low in all husbandry systems (62, 58, 61 for outdoor, indoor and combined systems, respectively), mainly because of the castration method practised without pain relief medication. The integrated score for “appropriate behaviour” was lower in indoor systems, because of lower “exploratory behaviour” scores (64). Considering the overall assessment across all principles, farms having only outdoor or only indoor system were classified as “enhanced” (total score of 77 and 74, respectively), whereas farms with combined system (indoor housing with outdoor access) were classified as “excellent” (total score of 85). The present study showed high welfare quality of housing systems with local breed Krškopolje pigs.

Minimising workers’ workload in partially automated assembly lines with human-robot collaboration

The benefits of automation in human-operated assembly lines are well known. Despite the rapid progress made in the field, complete automation is not always possible. Often robots cannot replace workers’ flexibility, and sometimes there is no economically viable option for automation. A combined production system with both manual and automated parts could be the best configuration in such circumstances. Even with partial automation the number of workers in the line could be decreased, and workers’ safety and health conditions could be dramatically improved.In this paper, MILP models are suggested to compare the total workload of workers when different numbers of robots are applied in an assembly line with partial automation and the minimum possible number of workers. The proposed MILP model is implemented in the AIMMS modelling environment and solved using CPLEX.The presented models can help evaluate the impact of adding robots to the line on total workers’ workload and may assist decision makers in finding the best possible line configuration.

Comparative analysis of the profitability of rice production systems in Kwara State, Nigeria


 
 
 This study describes the socioeconomic characteristics of rice farmers, identifies the production system used by the farmers, compares the profitability of rice production systems, identifies the factors influencing the choice of production systems among the farmers as well as the constraints to rice production systems. A three-stage random sampling procedure was used to select 120 rice farmers on whom a set structured questionnaire was administered. Data was analysed using descriptive statistics and multinomial logistic regression model. Results show that 48.3%, 35% and 16.7% of the farmers cultivate rice using the upland, lowland and the combined production systems respectively. The findings also reveal variability in yield, profit and income across the rice production systems. The gross margins for lowland, upland and combined rice production systems were N65,735.73, N67,900.89 and N78,015.57 per hectare respectively. The factors that influenced the choice of upland production system relative to combined production system were age, household size, farming years and extension visits while the factors that influenced the choice for combined rice production system relative to lowland rice production system was income. Inadequate finance to purchase inputs, problem of pests and diseases, and unfavorable climatic conditions are the constraints faced by rice farmers in the upland, lowland and combined production systems. The combined production systems had the highest return per hectare. Therefore, the study recommends that farmers should be encouraged to choose the combined rice production system for optimum profitability of rice production.
 
 

Energy and Exergy analysis and selection of the appropriate operating fluid for a combined power and hydrogen production system using a Geothermal fueled ORC and a PEM electrolyzer

This research aims to introduce an efficient power cycle that simultaneously produces power and hydrogen by PEM electrolyzer. This cycle is driven by geothermal energy. Comprehensive thermodynamic modeling (energy and exergy) has been performed to compare four different operating fluids' performance on the proposed system. EES software was used for modeling. A parametric study has also been applied to investigate the effect of important parameters on the system's energy and exergy performance. As a brief novelty statement, the unique model can be mentioned in which both power and chemicals can be produced, and hydrogen output can be used as a storage system that transforms energy into an energy carrier. The results showed that R245fa operating fluid with 3.5% and %67.6 of energy and exergy efficiency had the highest performance. The operating fluids R114, R600, and R236fa are also in the next ranks of performance characteristics. As the geothermal fluid temperature increases, the production of power and hydrogen increases, but the energy and exergy efficiency decrease. Also, it can be noted that the hydrogen unit significantly increases the exergy efficiency of the plant. As an example, in the R245fa case, it increases from 36% to 67.6%.

Optimal design and thermodynamic analysis on the hydrogen oxidation reactor in a combined hydrogen production and power generation system based on coal gasification in supercritical water

The novel power generation system based on coal gasification in supercritical water (SCW) holds great promise to meet the increasing energy demands in China, with less emissions in comparison to the traditional coal-fired power generation. The stable and complete oxidation of hydrogen occurring in the supercritical water oxidation (SCWO) reactor is paramount to the safety and overall energy efficiency of the system. In order to better understand and improve the performance of this reactor, optimal design and thermodynamic analysis were conducted using Aspen Plus. The outlet hydrogen concentration and the internal temperature of the reactor were taken as the two key indicators of the optimal design. The optimized results for the reactor were found to be the reactor diameter of 90 mm, axial length of 10.75 m, oxygen inlet number of 3 with the oxygen ratio of 11.0%/39.9%/49.1%, under the given inlet working fluid components and flow rates. The three-stage reactor design was confirmed to have good robustness when different types of coals are adopted for generating syngas. In addition, by analyzing the enthalpy and exergy flow distributions in the reactor, it was revealed that the total exergy destruction for the whole three-stage reactor is only about 6.29%, and that the exergy destruction is consistent with the oxidation process. These findings could be used as guidelines for the design and implementation of the SCWO reactor towards higher safety margin and energy efficiency for this new coal-boiled power generation technique.

A Study on the Commonly Adopted Energy Sources and Production Systems for Domestic Hot Water in the Calabria Region (Italy)

Worldwide, there are many options to ensure domestic hot water (DHW) provision in dwellings. This study aimed to depict the distribution of energy sources and DHW production systems in the Calabria region. The research was focused on understanding which variables, among contextual variables and building characteristics, may influence the adoption of a particular energy source or production system. Descriptive statistics and chi-square test of independence have been developed. Significant relationships were found between the climatic zone and the energy source used as well as between the climatic zone and the production system installed in both households with a separated and a combined DHW production system. Furthermore, the population of the municipality and the dwelling type resulted to be significant variables for the preference of an energy source or the diffusion of a combined production system.

Функціональний аналіз і розвиток інтегрованих виробничих систем промислових підприємств

The article specifies the key economic aspects of the functioning and development of integrated manufacturing systems of industrial enterprises. The article is aimed at substantiating the prospects for the development of integrated manufacturing systems as one of the paradigms of the organization of the production process. The methodological instrumentarium of the research consisted of the following methods: retrospective analysis, synthesis, critical analysis, graphic method, generalization method. In modern conditions, more and more attention is paid to the new integrated level of manufacturing systems, which can be considered as a combined production system from an aggregate of multi-level constituents of production systems of enterprises with the most progressive organizational and technological capabilities, created for a limited time in order to implement complex projects. The evolution of the organization of production systems with the allocation of modern paradigms of variability and integration is researched. The role of technological niches in the development and marketing of multitechnological platforms as examples of integrated manufacturing systems is outlined. The main requirements for production systems created in technological niches are such parameters as their flexibility, the level of automation and the possibility of integration. It is determined that flexible or integrated production means that the functional spectrum of multitechnological platforms should be maximized. The flexible production strategy is more profitable than conventional manufacturing, if there is a high probability that additional functions will actually be applied in the future, and the integration of functions will cause lower costs than the integration of an additional single-technology machine. Integration of manufacturing technologies is an urgent paradigm for designing production systems within the framework of evolutionary theory. The direction of technological progress is determined through the concept of suitability, which represents a fuzzy image of a prospective product developed in accordance with the technological paradigm in the selection environment. The problem of classification of flexible, reconfigured and integrated manufacturing systems is the prospect of further research.

MILP model to decrease the number of workers in assembly lines with human-robot collaboration

The benefits of automatization in human-operated assembly lines are well known. When complete automatization is not possible, a combined production system, with both manual and automated parts, could be the best configuration. Adding robots to an only human-operated assembly line may decrease the number of stations and consequently the number of workers in the line. Even if, the number of stations cannot be decreased, the number of workers could be reduced in case of proper reallocation of tasks. In this paper, three mixed-integer linear programming (MILP) models are suggested to minimize in three steps the number of workers, the number of robots, and the cycle time in an assembly line with a predefined number of stations and partial automatization. The results for the optimization problems are shown based on the data of an assembly line producing power inverters. The proposed MILP model is implemented in the AIMMS modeling environment.

Thermodynamic assessment and performance optimization of solid oxide fuel cell-Stirling heat engine–reverse osmosis desalination

Abstract Fuel cells are chemical energy converted to electric energy, which is today a new technology in energy production. Among the existing fuel cells, solid fuel oxide cells have a high potential for use in synthetic and combined production systems due to their high temperature (700–1000°C). The solid oxide fuel cell (SOFC) output acts as a high-temperature source, which can be used for heat engines such as the Stirling engine as a high-temperature heat source. A hybrid system including solid oxide fuel cell and Stirling engine and reverse osmosis desalinating is a cogeneration plant. This system includes two parts for power generation; the first part is power generated in the SOFC, and the second part is that with use of heat rejection of solid oxide fuel cell to generate power in the Stirling engine. Also, due to the water critical situation in the world and the need for freshwater, it is very common to use desalination systems. In this study, important goals such as power density and exergy destruction, and exergy efficiency, have been investigated. In general, the performance of the hybrid system has been investigated. Firstly, a thermodynamic analysis for all components of the system and then multi-objective optimization performed for several objective functions include exergy destruction density, exergy efficiency, fuel cell power and freshwater production rate. The present optimization is performed for two overall purposes; the first purpose is to improve fuel cell output power, exergy efficiency and exergy destruction density, and the second purpose is to improve the exergy efficiency, the amount of freshwater production and exergy destruction density. In this optimization, three robust decision-making methods TOPSIS, LINMAP and FUZZY are used. Two scenarios are presented; the first scenario is covering power, exergy efficiency and exergy destruction density. The output power and exergy efficiency, and exergy destruction density, have optimum values in the TOPSIS method’s results. The values are 939.393 (kW), 0.838 and 1139.85 (w/m2) respectively. In the second scenario that includes the freshwater production rate, the exergy destruction density and exergy efficiency, three objective functions are at their peak in the FUZZY results, which are 5.697 (kg/s), 7561.192 (w/m2) and 0.7421 respectively.

Simulation and modeling of a combined biomass gasification-solar photovoltaic hydrogen production system for methanol synthesis via carbon dioxide hydrogenation

One solution to achieving a large scale distribution, transportation and storage of renewable energy is methanol production from renewable-based power plants integrated with hydrogenation. In this study, a novel non-combustion heat-carrier biomass gasifier system is proposed, coupled with a large-scale solar power plant and alkaline water electrolysis system, for methanol production from syngas, water and carbon dioxide. Aspen Plus, MATLAB and TRNSYS are used to simulate and assess the performance of each component of the proposed system, under different climatic conditions of Toronto, Canada, and Crotone, Italy. In both localities, the best energy performance that minimizes the grid energy interaction factor is obtained with a photovoltaic station of 50.4 MW coupled to biomass gasification, which leads to 0.60 kWh and 0.57 kWh, respectively, in Toronto and Crotone, of electricity sent to or drawn from the grid for each kWh required by the electrolyser. However, higher profitability may be achieved in both localities with a single biomass gasification system which brings an enhanced benefit of 0.56 M€ in Toronto and 0.44 M€ in Crotone for each kW installed. It is expected that the developed modelling approach and these four newly formulated dimensionless indicators, i.e., the satisfied load fraction, utilization factor, grid energy interaction factor, and grid economic interaction value can be used to evaluate large-scale integrated renewable-based power systems.

Life cycle assessment of an innovative cogeneration system based on the aluminum combustion with water

The continuous increase in primary energy demand and the decrease in the availability of fossil fuels were led to a condition of energy security concerns. In this context, hydrogen can be seen as a promising energy carriers. This paper investigated the environmental performance, through Life Cycle Assessment (LCA) methodology, of a combined production system of hydrogen and power based on aluminum combustion with water. This system is potentially able to produce the integrated generation of four energy sources: hydrogen, high temperature steam, heat and work at the turbine shaft. The LCA results indicated that the life-cycle phases that determine the main environmental impact are: liquid aluminum production, transports of liquid aluminum and electricity consumption. In addition, the major release of carbon dioxide emissions is due to the use of natural gas in the aluminum production phase. In order to determine the “greener” alternative and support the system design choices, according to the eco-design perspective, different system configurations were investigated. In particular, the reaction mechanism between first primary aluminum powder and water steam and then secondary aluminum at liquid state and water steam. The environmental comparison highlighted that the former layout increases by more than 78% compared to latter one.

Remotely sensed primary productivity shows that domestic and native herbivores combined are overgrazing Patagonia

Abstract Carrying capacity is the maximum animal density an area can sustain without deterioration of its resources. Overgrazing has degraded Patagonia, but sheep stocks decreased and gave way to mixed systems with cattle, goats and guanacos (native wild camelids). The objective of this paper was to develop a method to estimate the carrying capacity based on the remotely sensed data, and to assess wild and domestic herbivore numbers in order to establish if grazing stocks have evolved to balance with carrying capacity. Net Primary Productivity (NPP) MOD17/A3 images and field Aerial Net Primary Productivity (ANPP) data of 66 sites were linearly regressed (R2 = 0.83, p < 0.01), and the slope 0.236 used to convert MOD17/A3 NPP to ANPP. Harvest index (proportion of ANPP that may be sustainably consumed) was estimated as a function of ANPP and carrying capacity as a consumable forage/estimated annual consumption, set at 500 (sheep and goats), 3,200 (cattle) and 750 kg Dry Matter head−1 year−1 (guanacos). Regional ANPP ± SD (2000–2015) was 758 ± 52 kg Dry Matter ha−1 year−1 and Harvest index was 13.7 ± 0.6%. Regional carrying capacity was 14.8 ± 1.6 M sheep or goats, 2.3 ± 0.3 M cattle or 9.9 ± 1.2 M guanacos. Domestic stock was high from 1920 to 1980, but declined thereafter and remained mostly within 1 SD of mean 2000–2015 carrying capacity. In this century, annual provincial stocks and carrying capacity correlated well (R2 = 0.94, p < 0.01) with a slope close to 1. Guanacos increased from 0.5 to 2 M between 2000 and 2015, driving linearly combined grazing pressures 36% and 62% above carrying capacity in southern Patagonia provinces in 2015. Synthesis and applications. From the year 2000, after decades of sheep overstocking, domestic stock has shown a regional trend towards a grazing equilibrium, but growth of guanacos might have upset that trend. Participation of guanacos as a critical excess in total grazing pressure is debatable, but management of these populations is necessary and may be increasingly attractive if combined production systems are developed to incorporate wild meat and fibre. Our method, MOD17/A3 enables a carrying capacity evaluation and stock adjustment in these unique mixed grazing systems, preventing further rangeland degradation and loss of ecosystem services.

Performance investigation of a combined heat and power system with internal and external combustion engines

In this paper, a new model of a combined heat and power system with hybrid prime mover including an internal combustion engine and an external combustion engine (Stirling engine) at different rotational speeds of the internal combustion engine is investigated. The recommended system can be used in building applications. Therefore, an internal combustion engine is used as the main prime mover of the system and for optimal using of the heating value of fuel, dissipated heat from its exhaust gas is used as the heat source of Stirling engine. Also, for estimating the performances of internal combustion and Stirling engines, a mathematical model called zero-dimensional single-zone and a numerical model called non-ideal adiabatic are used, respectively. Also, the combined production system has been modeled from viewpoints of thermal efficiency, overall efficiency, primary energy consumption, carbon dioxide emission and fuel consumption costs at different rotational speeds of the internal combustion engine and analyzed based on internal combustion engine (solely) and based on two engines (hybrid prime mover). Moreover, this system has been compared with a conventional energy production system for the building. Furthermore, a payback period in various working conditions for the system is calculated. Modeling results showed that using the hybrid prime mover led to a considerable increase in power output, thermal efficiency, and primary energy saving. Also, by using the hybrid system, the carbon dioxide emission and payback period had a dramatically reduction. In addition, for the combined production system with the internal combustion engine at rotational speed of 3500 rpm and operation of 9 h per day, the payback period was 10.5 years and for hybrid prime mover at this operation condition, it reduced to 7.5 years.

Analysis and performance assessment of a combined geothermal power-based hydrogen production and liquefaction system

In this paper, the thermodynamic study of a combined geothermal power-based hydrogen generation and liquefaction system is investigated for performance assessment. Because hydrogen is the energy of future, the purpose of this study is to produce hydrogen in a clear way. The results of study can be helpful for decision makers in terms of the integrated system efficiency. The presented integrated hydrogen production and liquefaction system consists of a combined geothermal power system, a PEM electrolyzer, and a hydrogen liquefaction and storage system. The exergy destruction rates, exergy destruction ratios and exergetic performance values of presented integrated system and its subsystems are determined by using the balance equations for mass, energy, entropy, energy and exergy and evaluated their performances by means of energetic and exergetic efficiencies. In this regard, the impact of some design parameters and operating conditions on the hydrogen production and liquefaction and its exergy destruction rates and exergetic performances are investigated parametrically. According to these parametric analysis results, the most influential parameter affecting system exergy efficiency is found to be geothermal source temperature in such a way that as geothermal fluid temperature increases from 130 °C to 200 °C which results in an increase of exergy efficiency from 38% to 64%. Results also show that, PEM electrolyzer temperature is more effective than reference temperature. As PEM electrolyzer temperature increases from 60 °C to 85 °C, the hydrogen production efficiency increases from nearly 39% to 44%.